Viewing archive of Sunday, 21 December 1997

Solar activity report

Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 1997 Dec 21 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 355 Issued at 2200Z on 21 DEC 1997

IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z

SOLAR ACTIVITY WAS LOW. TWO UNCORRELATED C-CLASS EVENTS OCCURRED DURING THE REPORTING PERIOD, THE FIRST A C7 FLARE AT 21/0354Z, AND THE SECOND A LONG DURATION C2 EVENT AT 21/1645Z. THE MOST PROBABLE GENERATOR OF THESE FLARES IS REGION 8124 (S22E66), A 7-SPOT 'EAO' BETA GROUP. THE ONLY OTHER ACTIVE REGION CURRENTLY ON THE VISIBLE DISK, REGION 8123 (N18W36), HAS BEEN QUIET WHILE DECAYING INTO A 3-SPOT 'CSO' BETA.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN LOW, DUE TO THE HIGH PROBABILITY FOR CONTINUED C-CLASS ACTIVITY FROM REGION 8124.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET AT ALL LATITUDES FOR THE PAST 24 HOURS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE MOSTLY QUIET, WITH THE CHANCE FOR ISOLATED PERIODS OF UNSETTLED CONDITIONS, FOR THE NEXT THREE DAYS.
III. Event Probabilities 22 DEC to 24 DEC
Class M10%10%10%
Class X01%01%01%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       21 DEC 092
  Predicted   22 DEC-24 DEC  092/092/094
  90 Day Mean        21 DEC 093
V. Geomagnetic A Indices
OBSERVED AFR/AP 20 DEC  003/002
ESTIMATED AFR/AP 21 DEC  004/003
PREDICTED AFR/AP 22 DEC-24 DEC  005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 22 DEC to 24 DEC
A. Middle Latitudes
Active15%15%15%
Minor storm05%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active15%15%15%
Minor storm05%05%05%
Major-severe storm01%01%01%

All times in UTC

<< Go to daily overview page

Latest news

Support SpaceWeatherLive.com!

A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!

SpaceWeatherLive Pro
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2024/12/08X2.2
Last M-flare2024/12/25M4.9
Last geomagnetic storm2024/12/17Kp5+ (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
November 2024152.5 -13.9
December 2024115.2 -37.3
Last 30 days120.1 -38.2

This day in history*

Solar flares
12011M5.77
22024M4.9
32024M2.8
41998M1.83
52001M1.76
DstG
11988-85
21998-57
31978-57G2
42014-49
52002-39
*since 1994

Social networks